This check is done independent of the miss chance resulting from Armor Class and other measures of not getting hit, such as Concealment or Incorporeality. The dodge chance is capped by the Maximum Dexterity Bonus of the armor worn and cannot exceed 25% without special feats or enhancements, such as Uncanny Dodge (see below) that allow a player to exceed this cap. Dodge bonuses from spells, enhancements, EDs, items, and feats stack.

As of Update 19, dodge bonuses on items no longer stack, only the best applies.

Swashbuckling Style (Tier 3, Multi-selector): Skirmisher: While Swashbuckling with a Buckler in your off hand you gain 10% Dodge, and you may use a Buckler and still benefit from the Single Weapon Fighting line of feats.

Embrace the Void: Gain 1/2/3 Meditation use per rest, +1/+2/+3 to Dodge Cap, and regenerate Ki faster while meditating. While you are meditating, you generate a protective shield which can absorb up to 25/50/100 damage, and is refreshed every 3 seconds.

Cauldron of Flame (Core, level 18): Fire Ki Spell-Like Ability. While inside the range of the ability and wielding a quarterstaff you gain +15% Dodge that ignores Dodge Cap.

Measure the Foe (Tier 5): Gain +6 Melee Power, +2 Dodge, +2 Maximum Dodge, +1 to hit and +1 to the DC's of your Assassinate abilities for every 4/2/1 seconds you remain stealthed. This effect stacks up to five times, and lasts 10 seconds after you come out of stealth.

Rogue Thief-Acrobat

Tumbler (Core, Lv 6): You can pass through enemies when you tumble. +2 maximum dodge.

Kip Up (Core, Lv 12): You are immune to most knockdown effects and slippery surfaces. +2 maximum dodge.

Previous to Update 14, Dodge used to be considered a bonus type, generally applying to armor class and sometimes reflex saves. In some very rare areas where the devs forgot to update the bonus types, there are still a few abilities/items that display as dodge bonuses to armor class in the breakdown, but officially the system has been discontinued, so they should be considered bugs.

Examples are:

Eldritch Shield Ritual and Eldritch Armor Ritual (Technically should count as bonuses types equal to their name per a dev post)

The Dodge bonus always stacks, except the ones you get from items. As of update 19, only the highest item based Dodge bonus will apply.

Prior to update 19, there were some issues with stacking sometimes. Depending on the order you equip your dodge items, the final result may not be correct. A work around for it was stripping off and re-equipping in a different order. (DDO Forums)